EP2385812B1 - Intramedullary anchoring stem for an orthopaedic implant head - Google Patents
Intramedullary anchoring stem for an orthopaedic implant head Download PDFInfo
- Publication number
- EP2385812B1 EP2385812B1 EP10702516.5A EP10702516A EP2385812B1 EP 2385812 B1 EP2385812 B1 EP 2385812B1 EP 10702516 A EP10702516 A EP 10702516A EP 2385812 B1 EP2385812 B1 EP 2385812B1
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- EP
- European Patent Office
- Prior art keywords
- stem
- implant according
- head
- implant
- recess
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 239000007943 implant Substances 0.000 title claims description 42
- 238000004873 anchoring Methods 0.000 title claims description 9
- 239000000463 material Substances 0.000 claims description 12
- 230000000295 complement effect Effects 0.000 claims description 7
- 230000000399 orthopedic effect Effects 0.000 claims description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- 239000010936 titanium Substances 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 229910052588 hydroxylapatite Inorganic materials 0.000 claims description 4
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
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- 241000272525 Anas platyrhynchos Species 0.000 claims 1
- 241000309551 Arthraxon hispidus Species 0.000 claims 1
- 238000005728 strengthening Methods 0.000 claims 1
- 210000000988 bone and bone Anatomy 0.000 description 21
- 210000003811 finger Anatomy 0.000 description 6
- 238000002513 implantation Methods 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 210000002683 foot Anatomy 0.000 description 4
- 241000405070 Percophidae Species 0.000 description 3
- 241000920340 Pion Species 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 238000011882 arthroplasty Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 210000003414 extremity Anatomy 0.000 description 2
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- 239000000560 biocompatible material Substances 0.000 description 1
- 230000001054 cortical effect Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
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- 239000013013 elastic material Substances 0.000 description 1
- 210000001255 hallux Anatomy 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- NUHSROFQTUXZQQ-UHFFFAOYSA-N isopentenyl diphosphate Chemical compound CC(=C)CCO[P@](O)(=O)OP(O)(O)=O NUHSROFQTUXZQQ-UHFFFAOYSA-N 0.000 description 1
- 210000000236 metacarpal bone Anatomy 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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Images
Classifications
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
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- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2002/4251—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for hands, e.g. fingers for metacarpo-phalangeal joints, i.e. MCP or MP joints, e.g. knuckle joints
Definitions
- the present invention relates to an orthopedic implant used in digital arthroplasty.
- proximal phalanx is meant a phalanx or a metacarpal or metatarsal bone element located on the side of the body or limb (hand or foot) concerned, and by phalanx distal a phalanx located towards the outside of this limb, according to the conventions of orientation adopted conventionally in anatomy, and which will also be used hereinafter.
- the invention can thus be used for inter-phalangeal digital joint prostheses (IP inch) or for Distal Inter-Phalangeal (IPD) prostheses, for the hand or for the foot.
- IP inch inter-phalangeal digital joint prostheses
- IPD Distal Inter-Phalangeal
- MCP meta-carpophalangeal digital joint prostheses
- MTP trapezo-metacarpal
- Interphalangeal articulation prostheses are already known comprising first and second elements each comprising respectively an implantation rod in the bone and a complementary inter-phalangeal articulation head.
- EP 1 339 362 an implant comprising a first element provided with a head having a convex surface of bi-condylar articulation and a second element provided with a complementary head.
- the elements of such prostheses consist of a piece, the rod having a solid pile-form integral with the head and arranged to be introduced inside the medullary cavity of a phalanx.
- the present invention which is defined in claim 1, aims to provide an orthopedic implant that better responds than those previously known to the requirements of the practice, particularly in that it generates very little wear despite numerous articulation movements, and in that it presents a great simplicity and a great ease of assembly by adapting to the constraints related to the subsequent operations of arthroplastic joints.
- the present invention Rather than take for granted the need for a solid and rigidly rigid implantation rod, to ensure the anchoring of a joint whose wear is then limited by the adoption of a particular shape of the heads, the present invention first accepted the questioning of the very design of the rod secured to the head.
- the rod may be in one piece, particularly suitable for implantation, without screwing into the intramedullary canal of the bone.
- the invention finally and in combination with this dissociation and rigid connection in one piece, made the rod itself more flexible in the dorso-palmar plane by providing a rod with apparent elasticity and rigidity close to the bone in which it is implanted.
- the invention makes it possible to propose a range of intra-medullary anchoring rods of great strength but whose deformation under stress is equivalent to that of the bone in the sagittal (anteroposterior) plane, plane following which the physiological constraints are mainly transmitted during the loading of the joint (pinching, gripping, ).
- the present invention provides an intra-medullary anchoring rod for an orthopedic implant head, removable relative to the head with which it comprises connection means, said rod comprising a body at least partially hollowed longitudinally, parallel to or substantially parallel to the dorso-palmar plane, characterized in that the rod is formed in one piece by said body, and in that it has a frustoconical pile shape or substantially frustoconical biologically compatible material.
- the rod is thus more flexible in this plane and better adaptable to the knuckles concerned, which limits the wear of the prosthesis by allowing a better and less traumatic grip of the bone on the stem.
- the longitudinally recessed portion is arranged to give said rod of determined shape and material elasticity and / or rigidity corresponding to determined values close to those of a bone, and in particular of a finger bone or of foot.
- the determined values may be chosen by those skilled in the art according to the particular characteristics of the patient's bone to be treated, as described below with reference to the so-called “effective” or apparent Young's modulus.
- effective or apparent Young's modulus is meant a global Young's modulus of the stem whose behavior is identical to that of a bone element.
- the bone is assimilated to a cortical tube of Young's modulus of the order of 20 Gpa, the spongy part therefore not participating. no or little resistance.
- This tubular bone is then transformed into a homogeneous material, that is to say into a solid base which then has said effective Young's modulus.
- the thickness of the tube is of the order of 1.5 mm, and the effective Young's modulus of the equivalent solid rod is then of the order of 16 Gpa.
- the thickness of the cortex is closer to 1 mm and the equivalent module is then of the order of 13 Gpa.
- the invention also proposes an implant comprising an intra-phalangeal articulation head comprising a rod as described above.
- the material of the rod is different from the material of the hinge head.
- two apparent stiffnesses or effective Young's moduli of different stems can be provided according to the patients, ie a rigid stem for the young patients (ie less than of the order of 30 GPa) and a more flexible stem for the patients. aged (ie less than of the order of 15 GPa), the head being in turn of lower Young's modulus polyethylene, for example ⁇ 5 Gpa, for example 2 Gpa.
- connection means are identical between firstly, several heads of different sizes and secondly, identical or different rods of first elements and / or second elements.
- the invention also proposes a method of placing a stem of an orthopedic implant for digital arthroplasty of the type described above.
- the figure 1 is a diagrammatic view from above of a skeleton hand 1, comprising orthopedic implant rods 2 according to the invention.
- the implant comprises a first element 3 for proximal phalanx 4 and a second element 5 for distal phalanx 6.
- Each element comprises respectively an implantation rod or anchoring in the bone 7, 8 and an articulating head 9, 10 inter-phalangeal.
- the figure 2 shows the rod 7 removable anchor relative to the head 9 of the first element 3 (cf figure 3 ) in bio compatible material, for example titanium.
- It comprises an elongate portion 11 substantially around an axis 12, slightly curved, for example with a radius of curvature p of 100 mm for a rod for proximal element of large size and 90 mm for proximal element of medium or small size or still between 50 mm (large size), 40 mm (medium size) and 10 mm (small size) for distal elements.
- the rod is provided with a portion 13 arranged to be introduced into the central hole of the spinal cord of the phalanx, of substantially frustoconical polygonal shape, for example hexagonal with an enlarged end portion 14 with a facet 15 allowing a good introduction and a lateral locking in indexing in the modular cavity of the phalanx.
- the rod 7 is removably mounted relative to the head and comprises means 16 for connection with said head.
- connection means comprise a conical aperture 17 into which a conical pin 18 engages (cf. Figure 5A ) integral with the head 9, for example a Morse taper or having a taper angle of 2 to 3 degrees.
- Pion and recess are complementary shapes and cooperate friction with each other.
- the rod further comprises a plate 19 anti-depression which comes to cooperate with a complementary recess in the form of a groove 20 (see figure 3 ) which makes it possible, when the pin 18 is pushed into the orifice 17 and the pad 19 is locked in the recess 20, to securely fasten and index the head 9 with the rod 7.
- the rod 7 further comprises at least one recessed portion 21 in the dorso-palmar plane 22, which gives it the desired flexibility and which will be detailed hereinafter.
- the figure 3 shows the head 9 of the first element 3.
- the figure 4 shows as to the head 10 of the second element.
- This has a bi-concave surface 24 arranged to cooperate with the bi-convex surface 21 of the head of the first element and provided with a central ridge 24 '.
- the surfaces 23 and 24 are for example arranged to be congruent at the two condyles 25 and 26 and concave surfaces corresponding 27 and 28 in the frontal plane of the joint and not congruent in the sagittal plane.
- the line of friction in the frontal plane is effectively transformed into a surface 29, which makes it possible to better distribute the friction forces, and thus to minimize end wear of the head.
- this head which may for example be a UHMWPE-type polymer, the respective radii of curvature mentioned above, and characteristics of the invention, a further improved damping and a reduced wear of the prosthesis in time.
- contact zone 29 scans half of the condyle but remains at about the same place on the distal part.
- the most fragile surface is then selected on the condyle side, the flexibility of the rods in the dorso-palmar plane also allowing even better distributed wear as indicated above.
- the figure 6 is a sectional view of a first element 30 comprising the head 9 and the rod 7, the pin 18 forcing itself into the orifice 17.
- the recess 21 allows good flexibility (arrow 31) in the plane 32 perpendicular to the dorso-palmar plane 22.
- FIGS. 7 to 11 show rods for distal or proximal element of different shapes and lengths according to different embodiments of the invention.
- the stem 33 of the figure 7 has on one side an anti-depression plate 34 of the type described with reference to the figure 2 , pierced with a hole for receiving the pin of the head.
- the solid portion 35 is extended in the opposite direction to the plate of a portion 36 in a flat bevel provided with a through slot 37 over its entire length of thin, for example 2 mm in the dorsal plane palmar, which gives it a normal form of duckbill.
- the figure 8 shows another embodiment of the rod 38 representing a part 39 suitable to be embedded in the bone, substantially pyramidal or frustoconical H-shaped cross section, thus releasing on either side of the dorso-palmar plane 40 substantially parallelepipedal recesses, the end 41 in the shape of a beak to the plate 42 anti-sinking.
- the figure 9 shows another rod 43 comprising a part 44 of frustoconical shape provided on its lower surface with a chute 45 giving the stem a recessed shape on the 2/3 to 9/10 th of its length.
- the figure 10 shows in turn a half-rod 46 substantially cylindrical tube-shaped 47 comprising an end portion 48 provided with the plate 49, pierced with a recess 50 to cooperate with the pin of the head as described above, recess 50 being extended by a bore 51 over the entire length of the tube 47.
- the figure 11 shows a rod 52 shaped folded sheet having an end portion 53 of U-shaped cross-section.
- the rods are rough.
- This roughness is for example obtained by sanding or corunduming, or by transverse grooves (not shown), to increase the adhesion in the bone.
- an osteo-integrative coating is advantageously provided by example of the Hydroxyapatite type (HAP initials) or formed of microporous titanium by plasma deposition.
- HAP initials Hydroxyapatite type
- microporous titanium by plasma deposition.
- the housing of the rods (introduction of rasps) are prepared, then introduced into the medullary canal the fixation rod.
- a test is then performed with a phantom of the other distal head.
- the rod 8 in the distal phalanx and the joint is then finalized by setting up the head 10.
- the head 10 can be chosen with several different thicknesses for its base allows adjustment during the operation.
- the present invention is not limited to the embodiments more particularly described. She embraces contrary to all variants and in particular those where the anchor rods are non-metallic, for example bio-compatible polyethylene, or are in a metal other than titanium, those where the prosthesis is an IP prosthesis thumb or big toe, or a IPD, or meta-carpophalangeal prosthesis which involves different dimensions and a different articular surface design so as to allow adequate lateral mobility.
- the anchor rods are non-metallic, for example bio-compatible polyethylene, or are in a metal other than titanium
- the prosthesis is an IP prosthesis thumb or big toe, or a IPD, or meta-carpophalangeal prosthesis which involves different dimensions and a different articular surface design so as to allow adequate lateral mobility.
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- Heart & Thoracic Surgery (AREA)
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Description
La présente invention concerne un implant orthopédique utilisé en arthroplastie digitale.The present invention relates to an orthopedic implant used in digital arthroplasty.
Elle trouve une application particulièrement importante bien que non exclusive dans le domaine médical des prothèses de l'articulation Inter-Phalangienne Proximale de la main (connue dans le domaine par ses initiales IPP).It finds a particularly important, although not exclusive, application in the medical field of prostheses of the Inter-Phalangeal articulation Proximal to the hand (known in the field by its initials IPP).
Mais elle est également applicable plus généralement aux articulations entre d'autres types de phalange dite proximale et une phalange adjacente distale.But it is also applicable more generally to the joints between other types of so-called proximal phalanx and an adjacent distal phalanx.
Par phalange dite proximale on entend une phalange ou un élément osseux métacarpien ou métatarsien situé du côté du corps ou du membre (main ou pied) concerné, et par phalange distale une phalange située vers l'extérieur de ce membre, selon les conventions d'orientation adoptée classiquement en anatomie, et qui seront par ailleurs utilisées ci-après.By so-called proximal phalanx is meant a phalanx or a metacarpal or metatarsal bone element located on the side of the body or limb (hand or foot) concerned, and by phalanx distal a phalanx located towards the outside of this limb, according to the conventions of orientation adopted conventionally in anatomy, and which will also be used hereinafter.
L'invention peut ainsi être utilisée pour des prothèses articulaires digitales Inter-Phalangiennes du pouce (IP pouce) ou pour des prothèses Inter-Phalangiennes Distales (IPD), pour la main ou pour le pied.The invention can thus be used for inter-phalangeal digital joint prostheses (IP inch) or for Distal Inter-Phalangeal (IPD) prostheses, for the hand or for the foot.
Elle peut aussi être avantageusement utilisée pour des prothèses articulaires digitales méta-carpophalangiennes (dits MCP), trapezo-métacarpiennes (dits MTP), ici encore pour la main ou pour le pied, et ce par simple adaptation géométrique aux sites osseux concernés.It can also be advantageously used for meta-carpophalangeal digital joint prostheses (called MCP), trapezo-metacarpal (so-called MTP), here again for the hand or for the foot, and this by simple geometric adaptation to the bone sites concerned.
On connaît déjà des prothèses d'articulation inter-phalangiennes comprenant des premiers et des seconds éléments comportant chacun respectivement une tige d'implantation dans l'os et une tête d'articulation inter-phalangienne complémentaire.Interphalangeal articulation prostheses are already known comprising first and second elements each comprising respectively an implantation rod in the bone and a complementary inter-phalangeal articulation head.
Par exemple il est connu (
Les éléments de telles prothèses sont constitués d'une pièce, la tige présentant une forme de pieu plein solidaire de la tête et agencé pour être introduit à l'intérieur de la cavité médullaire d'une phalange.The elements of such prostheses consist of a piece, the rod having a solid pile-form integral with the head and arranged to be introduced inside the medullary cavity of a phalanx.
Le problème résolu par ce type de prothèse est celui de l'usure des surfaces articulaires, la tige elle-même étant considérée comme secondaire.The problem solved by this type of prosthesis is that of the wear of the articular surfaces, the stem itself being considered as secondary.
On connaît également (
Ici encore le problème de l'usure des prothèses est strictement résolu grâce à une adaptation des surfaces d'articulation entre elles.Here again the problem of wear of the prostheses is strictly solved thanks to an adaptation of the articulation surfaces between them.
On connaît aussi (
La présente invention qui est définie dans la revendication 1 vise à fournir un implant orthopédique répondant mieux que ceux antérieurement connus aux exigences de la pratique notamment en ce qu'elle engendre une usure très faible malgré de nombreux mouvements d'articulation, et en ce qu'elle présente une grande simplicité et une grande facilité de montage en s'adaptant aux contraintes liées aux fonctionnements ultérieurs des articulations arthroplastiques.The present invention, which is defined in
Pour ce faire, elle part notamment d'une approche différente de celle de l'art antérieur.To do this, it starts from a different approach to that of the prior art.
Plutôt que de prendre pour acquis la nécessité d'une tige d'implantation pleine et solidement rigide, pour assurer l'ancrage d'une articulation dont on limite ensuite l'usure par l'adoption d'une forme particulière des têtes, la présente invention a tout d'abord accepté la remise en cause de la conception même de la tige solidaire de la tête.Rather than take for granted the need for a solid and rigidly rigid implantation rod, to ensure the anchoring of a joint whose wear is then limited by the adoption of a particular shape of the heads, the present invention first accepted the questioning of the very design of the rod secured to the head.
Elle l'a donc en premier lieu rendue amovible par rapport à la tête, ce qui permet notamment l'utilisation de deux matériaux différents et le remplacement de la tête sans avoir à retirer la tige.It has therefore first made removable from the head, which allows including the use of two different materials and replacement of the head without having to remove the rod.
La tige peut être d'une seule pièce notamment propre à être implantée, sans vissage dans le canal intra-médullaire de l'os.The rod may be in one piece, particularly suitable for implantation, without screwing into the intramedullary canal of the bone.
L'invention a enfin et en combinaison avec cette dissociation et liaison rigide d'un seul tenant, rendu la tige elle même plus flexible dans le plan dorso-palmaire en proposant une tige présentant une élasticité apparente et une rigidité proche de l'os dans lequel elle est implantée.The invention finally and in combination with this dissociation and rigid connection in one piece, made the rod itself more flexible in the dorso-palmar plane by providing a rod with apparent elasticity and rigidity close to the bone in which it is implanted.
L'ensemble de ces éléments pris en combinaison va entraîner un comportement plus naturel des têtes contre elles, avec pour conséquence inattendue de limiter considérablement leur usure tout en présentant les avantages des monopièces connus au niveau de la solidité, c'est à dire sans la fragilité et la complexité des implants multipièces de l'art antérieur.All of these elements taken in combination will cause a more natural behavior of the heads against them, with the unexpected consequence of considerably limiting their wear while presenting the advantages of the known one-pieces in terms of strength, that is to say without the fragility and complexity of the multi-piece implants of the prior art.
En d'autres termes l'invention permet de proposer une gamme de tiges d'ancrage intra médullaire d'une grande solidité mais dont la déformation sous contrainte est équivalente à celle de l'os dans le plan sagittal (antéro-postérieur), plan suivant lequel les contraintes physiologiques sont majoritairement transmises lors de la mise en charge de l'articulation (pincement, aggripement,...).In other words, the invention makes it possible to propose a range of intra-medullary anchoring rods of great strength but whose deformation under stress is equivalent to that of the bone in the sagittal (anteroposterior) plane, plane following which the physiological constraints are mainly transmitted during the loading of the joint (pinching, gripping, ...).
Les phénomènes de contraintes dits de « stress-shielding » (en langue anglo-saxonne) associés aux différences de rigidité entre l'os et les pièces prothétiques sont dès lors minimisés, favorisant l'ostéo-intégration de la tige intramédullaire.Stress-shielding phenomena associated with stiffness differences between the bone and the prosthetic parts are therefore minimized, favoring the osteointegration of the intramedullary rod.
Dans ce but la présente invention propose une tige d'ancrage intra médullaire pour tête d'implant orthopédique, amovible par rapport à la tête avec qui elle comprend des moyens de connexion, ladite tige comprenant un corps au moins en partie évidé longitudinalement, parallèlement ou sensiblement parallèlement au plan dorso-palmaire, caractérisé en ce que la tige est formée d'une seule pièce par ledit corps, et en ce qu'elle présente une forme de pieu tronconique ou sensiblement tronconique en matériau biologiquement compatible.For this purpose the present invention provides an intra-medullary anchoring rod for an orthopedic implant head, removable relative to the head with which it comprises connection means, said rod comprising a body at least partially hollowed longitudinally, parallel to or substantially parallel to the dorso-palmar plane, characterized in that the rod is formed in one piece by said body, and in that it has a frustoconical pile shape or substantially frustoconical biologically compatible material.
Grâce à cette modularité, à une forme de la tige allégée dans le plan dorso-palmaire, celle-ci étant fabriquée dans un matériau biologiquement compatible déterminé, la tige est ainsi plus souple dans ce plan et mieux adaptable aux phalanges concernées, ce qui limite l'usure de la prothèse en permettant une accroche meilleure et moins traumatisante de l'os sur la tige.Thanks to this modularity, a shape of the lightened rod in the dorso-palmar plane, the latter being manufactured in a biologically compatible material determined, the rod is thus more flexible in this plane and better adaptable to the knuckles concerned, which limits the wear of the prosthesis by allowing a better and less traumatic grip of the bone on the stem.
Particulièrement avantageusement la partie évidée longitudinalement est agencée pour conférer à ladite tige de forme et de matériau déterminés une élasticité et/ou une rigidité correspondantes à des valeurs déterminées proches de celles d'un os, et notamment d'un os de doigt de main ou de pied.Particularly advantageously the longitudinally recessed portion is arranged to give said rod of determined shape and material elasticity and / or rigidity corresponding to determined values close to those of a bone, and in particular of a finger bone or of foot.
Les valeurs déterminées peuvent être choisies par l'homme du métier en fonction des caractéristiques particulières de l'os du patient à soigner, comme décrit ci-après en référence au module d'Young dit « effectif » ou apparent.The determined values may be chosen by those skilled in the art according to the particular characteristics of the patient's bone to be treated, as described below with reference to the so-called "effective" or apparent Young's modulus.
Dans des modes de réalisation avantageux, on a de plus recours à l'une et/ou à l'autre des dispositions suivantes :
- la tige présente un rayon de courbure non nul agencé pour s'adapter à l'intérieur de la cavité médullaire d'une phalange ;
- elle présente une butée d'extrémité anti-enfoncement ;
- la forme de la tige au moins en partie évidée et son matériau lui confèrent un module d'Young effectif Eeff < 30 Gpa ;
- the stem has a non-zero radius of curvature arranged to fit inside the medullary cavity of a phalanx;
- it has an end stop anti-depression;
- the shape of the rod at least partially hollowed out and its material give it an effective Young's modulus E eff <30 Gpa;
Par module d'Young effectif ou apparent on entend un module d'Young global de la tige dont le comportement est identique à celui d'un élément osseux.By effective or apparent Young's modulus is meant a global Young's modulus of the stem whose behavior is identical to that of a bone element.
Dans la pratique, et pour calculer la module d'Young effectif tel qu'envisagé dans la présente invention, on assimile l'os à un tube cortical de module d'Young de l'ordre de 20 Gpa, la partie spongieuse ne participant donc pas ou peu à la résistance.In practice, and to calculate the effective Young's modulus as envisaged in the present invention, the bone is assimilated to a cortical tube of Young's modulus of the order of 20 Gpa, the spongy part therefore not participating. no or little resistance.
On transforme ensuite cet os tubulaire en un matériau homogène, c'est à dire en une base pleine qui présente alors ledit module d'Young effectif.This tubular bone is then transformed into a homogeneous material, that is to say into a solid base which then has said effective Young's modulus.
Par exemple pour un os jeune (≤ 35 ans) l'épaisseur du tube est de l'ordre de 1,5 mm, et le module d'Young effectif de la tige pleine équivalente est alors de l'ordre de 16 Gpa.For example, for a young bone (≤ 35 years), the thickness of the tube is of the order of 1.5 mm, and the effective Young's modulus of the equivalent solid rod is then of the order of 16 Gpa.
Pour une personne âgée, l'épaisseur de la corticale est plus proche de 1 mm et le module équivalent est alors de l'ordre de 13 Gpa.For an older person, the thickness of the cortex is closer to 1 mm and the equivalent module is then of the order of 13 Gpa.
Le module d'Young effectif ou apparent de la tige est donc la combinaison entre le module intrinsèque et un facteur géométrique ;
- le module d'Young effectif est Eeff < 20 Gpa, par
exemple 16 Gpa ; - le module d'Young effectif est Eeff < 15 Gpa, par
exemple 12 ou 13 GPa ; - la tige présente une section transversale en H ;
- elle présente une section transversale en U ou en V ;
- elle présente une fente en bec de canard dans le plan dorso-palmaire ;
- elle présente une forme évidée en demi-cylindre côté palmaire ou en demi-tube ;
- les moyens de connexion sont formés par un emmanchement conique d'un pion solidaire de la tête dans un évidement ménagé dans la tige correspondante. L'évidement est de forme complémentaire à celle du pion ;
- la tige est dissymétrique par rapport à un plan médian passant par l'axe de l'évidement, parallèle au plan dorso-palmaire ;
- l'emmanchement conique est un cône Morse, c'est à dire avec un angle de conicité de l'ordre de 5 % : mais cette conicité peut également être plus faible, par exemple de l'ordre de 3 % ou 2,5 % ;
- les moyens de connexion entre la tige et la tête correspondante comprennent de plus un évidement ou une rainure formé dans l'une des parties propre à recevoir une plaquette de forme complémentaire solidaire de l'autre partie ;
- la tige comporte au moins en partie un revêtement ostéo-intégrateur augmentant l'ancrage ;
- la tige est en titane micro-poreux et/ou est revêtu d'hydroxyapatite ;
- la tige est ajourée par au moins un évidement traversant transversalement ou sensiblement transversalement ladite tige.
- the effective Young's modulus is E eff <20 Gpa, for example 16 Gpa;
- the effective Young's modulus is E eff <15 Gpa, for example 12 or 13 GPa;
- the stem has an H-shaped cross section;
- it has a cross section U or V;
- it has a duckbill split in the dorso-palmar plane;
- it has a recessed half-cylinder shape on the palmar side or half-tube;
- the connection means are formed by a conical fitting of a pin integral with the head in a recess formed in the corresponding rod. The recess is of complementary shape to that of the pawn;
- the stem is asymmetrical with respect to a median plane passing through the axis of the recess, parallel to the dorso-palmar plane;
- the conical fitting is a Morse cone, that is to say with a taper angle of the order of 5%: but this taper may also be smaller, for example of the order of 3% or 2.5% ;
- the connection means between the rod and the corresponding head further comprise a recess or a groove formed in one of the parts adapted to receive a complementary shaped plate integral with the other part;
- the stem comprises at least partly an osteo-integrative coating increasing the anchoring;
- the stem is made of microporous titanium and / or is coated with hydroxyapatite;
- the rod is pierced by at least one recess traversing transversely or substantially transversely said rod.
L'invention propose également un implant comprenant une tête d'articulation intra phalangienne comportant une tige telle que décrite ci-dessus.The invention also proposes an implant comprising an intra-phalangeal articulation head comprising a rod as described above.
Avantageusement le matériau de la tige est différent du matériau de la tête d'articulation.Advantageously, the material of the rod is different from the material of the hinge head.
Plus précisément, on peut prévoir deux raideurs apparentes ou modules d'Young effectif de tiges différents selon les patients, soit une tige rigide pour les patients jeunes (i.e. inférieur à de l'ordre de 30 GPa) et une tige plus souple pour les patients âgés (i.e. inférieur à de l'ordre de 15 GPa), la tête étant quant à elle en polyéthylène de module d'Young différent plus faible, par exemple < 5 Gpa, par exemple de 2 Gpa.More precisely, two apparent stiffnesses or effective Young's moduli of different stems can be provided according to the patients, ie a rigid stem for the young patients (ie less than of the order of 30 GPa) and a more flexible stem for the patients. aged (ie less than of the order of 15 GPa), the head being in turn of lower Young's modulus polyethylene, for example <5 Gpa, for example 2 Gpa.
Enfin l'invention propose un ensemble d'implants pour lesquels les moyens de connexion sont identiques entre d'une part, plusieurs têtes de tailles différentes et d'autre part, des tiges identiques ou différentes de premier éléments et/ou de second éléments.Finally, the invention proposes a set of implants for which the connection means are identical between firstly, several heads of different sizes and secondly, identical or different rods of first elements and / or second elements.
Une telle disposition autorise une grande modularité.Such an arrangement allows a great modularity.
L'invention propose aussi un procédé de mise en place d'une tige d'un implant orthopédique pour arthroplastie digitale du type décrit ci-dessus.The invention also proposes a method of placing a stem of an orthopedic implant for digital arthroplasty of the type described above.
Elle sera mieux comprise à la lecture de la description qui suit de modes de réalisation donnés ci-après à titre d'exemples non limitatifs.It will be better understood on reading the following description of embodiments given below by way of non-limiting examples.
La description se réfère aux dessins qui l'accompagnent dans lesquels :
- La
figure 1 est une vue schématique de dessus, d'un squelette de main dans lequel des tiges d'implant selon l'invention ont été mises en place. - La
figure 2 montre en perspective une tige d'implant selon un premier mode de réalisation de l'invention. - Les
figures 3 et 4 sont des vues en perspective d'exemples de têtes, bi-convexe et bi-concave, propres à s'adapter à la tige de lafigure 2 . - La
figure 4 est une vue schématique de dessus (ou dorsale) montrant un implant selon l'invention, articulation allongée. - Les
figures 5A et 5B sont des schémas en coupe des têtes d'articulation respectivement en position doigt fléchi, et doigt droit, illustrant la flexibilité des tiges propice à la minimisation de l'usure des surfaces d'articulation. - La
figure 6 est une vue en coupe latérale d'un élément d'implant comprenant une tige et une tête selon un mode de réalisation de l'invention. - Les
figures 7 à 11 montrent en perspective arrière, cinq modes de réalisation de tige pour implant selon l'invention.
- The
figure 1 is a diagrammatic view from above, of a hand skeleton in which implant stems according to the invention have been put in place. - The
figure 2 shows in perspective an implant rod according to a first embodiment of the invention. - The
Figures 3 and 4 are perspective views of examples of heads, bi-convex and bi-concave, adapted to fit the stem of thefigure 2 . - The
figure 4 is a schematic view from above (or dorsal) showing an implant according to the invention, elongate joint. - The
Figures 5A and 5B are cross-sectional diagrams of the hinge heads respectively in flexed finger position, and right finger, illustrating the flexibility of the rods conducive to the minimization of wear of the articulation surfaces. - The
figure 6 is a side sectional view of an implant element comprising a shaft and a head according to an embodiment of the invention. - The
Figures 7 to 11 show in rear perspective, five embodiments of implant rod according to the invention.
La
L'implant comprend un premier élément 3 pour phalange proximale 4 et un second élément 5 pour phalange distale 6.The implant comprises a
Chaque élément comporte respectivement une tige d'implantation ou d'ancrage dans l'os 7, 8 et une tête d'articulation 9, 10 inter-phalangienne.Each element comprises respectively an implantation rod or anchoring in the
On utilisera par la suite les mêmes numéros de référence pour désigner des éléments semblables ou identiques.The same reference numbers will subsequently be used to designate similar or identical elements.
La
Elle comporte une partie allongée 11 sensiblement autour d'un axe 12, légèrement courbe, par exemple avec un rayon de courbure p de 100 mm pour une tige pour élément proximal de grande taille et de 90 mm pour élément proximal de moyenne ou petite taille ou encore compris entre 50 mm (grande taille), 40 mm (taille moyenne) et 10 mm (petite taille) pour les éléments distals.It comprises an
La tige est munie d'une partie 13 agencée pour être introduite dans le trou central de la moelle épinière de la phalange, de forme sensiblement tronconique polygonale, par exemple hexagonale avec une partie élargie d'extrémité 14 à facette 15 permettant une bonne introduction et un blocage latéral en indexation dans la cavité modulaire de la phalange.The rod is provided with a
La tige 7 est montée de façon amovible par rapport à la tête et comporte des moyens 16 de connexion avec ladite tête.The rod 7 is removably mounted relative to the head and comprises means 16 for connection with said head.
Ces moyens de connexion comportent un orifice 17 conique dans lequel vient s'emmancher un pion conique 18 (cf
Pion et évidement sont de formes complémentaires et coopèrent à frottement l'un avec l'autre.Pion and recess are complementary shapes and cooperate friction with each other.
La tige comporte de plus une plaquette 19 anti-enfoncement qui vient coopérer avec un évidement complémentaire en forme de rainure 20 (voir
Selon l'invention la tige 7 comporte de plus au moins une partie évidée 21 dans le plan dorso-palmaire 22, qui lui confère la flexibilité recherchée et qui sera détaillée ci-après.According to the invention the rod 7 further comprises at least one recessed
La
Elle présente une surface 23 d'articulation condylienne bi-convexe comportant une vallée centrale 23'.It has a bi-convex
La
Celle-ci présente une surface bi-concave 24 agencée pour coopérer avec la surface bi-convexe 21 de la tête du premier élément et munie d'une crête centrale 24'.This has a
Les surfaces 23 et 24 sont par exemple agencées pour être congruentes au niveau des deux condyles 25 et 26 et des surfaces concaves correspondantes 27 et 28 dans le plan frontal de l'articulation et non congruentes dans le plan sagittal.The
Mais tous autres types de tête sont parfaitement envisageables.But all other types of head are perfectly conceivable.
On a représenté sur la
La ligne de frottement dans le plan frontal se transforme en effet en une surface 29, ce qui permet de mieux répartir les efforts de friction, et de minimiser ainsi l'usure à terme de la tête.The line of friction in the frontal plane is effectively transformed into a
Grâce à la combinaison du matériau de cette tête, qui peut par exemple être un polymère type UHMWPE, des rayons de courbure respectifs mentionnés ci-dessus, et des caractéristiques de l'invention on obtient ainsi un amortissement encore amélioré et une usure minimisée de la prothèse dans le temps.By virtue of the combination of the material of this head, which may for example be a UHMWPE-type polymer, the respective radii of curvature mentioned above, and characteristics of the invention, a further improved damping and a reduced wear of the prosthesis in time.
On constate à ce sujet que la zone de contact 29 balaye la moitié du condyle mais reste à peu près au même endroit sur la partie distale.It is noted in this regard that the
Avantageusement la surface la plus fragile est alors choisie coté condyle, la flexibilité des tiges dans le plan dorso-palmaire autorisant par ailleurs une usure encore mieux répartie comme indiqué ci-avant.Advantageously, the most fragile surface is then selected on the condyle side, the flexibility of the rods in the dorso-palmar plane also allowing even better distributed wear as indicated above.
On a représenté sur les
Le fait d'uniformiser et de standardiser les dimensions des pions 18 et des orifices 17 permet par ailleurs d'adapter indifféremment une tête d'une certaine dimension avec une tige de taille différente ce qui autorise une grande modularité.The fact of standardizing and standardizing the dimensions of the
D'autres moyens d'assemblage mécanique de la tête sur la tige sont bien-entendu possibles.Other means of mechanical assembly of the head on the rod are of course possible.
La
L'évidement 21 permet une bonne flexibilité (flèche 31) dans le plan 32 perpendiculaire au plan dorso-palmaire 22.The
Les
La tige 33 de la
La partie pleine 35 est prolongée dans la direction opposée à la plaque d'une portion 36 en biseau plat munie d'une fente débouchante 37 sur toute sa longueur de faible épaisseur, par exemple 2 mm dans le plan dorsal palmaire, ce qui lui confère une forme normale de bec de canard.The
La
La
La
La
Dans les modes de réalisation de l'invention plus particulièrement décrits ici, les tiges sont rugueuses.In the embodiments of the invention more particularly described here, the rods are rough.
Cette rugosité est par exemple obtenue par sablage ou corindonage, ou par des cannelures transversales (non représentées), permettant d'augmenter l'adhérence dans l'os.This roughness is for example obtained by sanding or corunduming, or by transverse grooves (not shown), to increase the adhesion in the bone.
Afin d'améliorer encore l'ancrage un revêtement ostéo-intégrateur est avantageusement prévu par exemple du type Hydroxyapatite (initiales HAP) ou formé en titane micro-poreux par dépôt plasma.In order to further improve the anchoring, an osteo-integrative coating is advantageously provided by example of the Hydroxyapatite type (HAP initials) or formed of microporous titanium by plasma deposition.
On va maintenant décrire la mise en place d'une prothèse selon l'invention lors d'une opération d'implantation.We will now describe the establishment of a prosthesis according to the invention during an implantation operation.
Après ouverture du doigt et section des parties osseuses endommagées de façon à mettre en place la prothèse, de façon connue en elle-même, (première étape de résection osseuse) on prépare les logements des tiges (introduction de râpes), puis on introduit dans le canal médullaire la tige de fixation.After opening the finger and section of the damaged bone parts so as to place the prosthesis, in a manner known per se, (first bone resection step) the housing of the rods (introduction of rasps) are prepared, then introduced into the medullary canal the fixation rod.
On vérifie alors l'espace disponible pour la mise en place des têtes puis on emboîte la tête proximale condylienne 9 qui vient se fixer de façon précise et bloquée par le biais du cône morse sur ladite tige.We then check the space available for the establishment of the heads and then fits the condylar
On effectue alors un test avec un fantôme de l'autre tête distale.A test is then performed with a phantom of the other distal head.
Puis, après le choix de l'épaisseur en fonction de la résection préalable de l'os, on met en place de l'autre côté, la tige 8 dans la phalange distale et l'articulation est alors finalisée par mise en place de la tête 10.Then, after the choice of the thickness according to the pre-resection of the bone, is placed on the other side, the
Le fait que la tête 10 puisse être choisie avec plusieurs épaisseurs différentes pour sa base, permet un ajustage pendant l'opération.The fact that the
L'ensemble de ces opérations s'effectue de façon connue en elle-même à l'aide d'ancillaires dédiés.All these operations are carried out in a known manner in itself using dedicated ancillaries.
Comme il va de soi et comme il résulte également de ce qui précède, la présente invention n'est pas limitée aux modes de réalisation plus particulièrement décrits. Elle en embrasse au contraire toutes les variantes et notamment celles où les tiges d'ancrage sont non métalliques, par exemple en polyéthylène bio-compatible, ou sont en un autre métal que le titane, celles où la prothèse est une prothèse IP pouce ou gros orteil, ou une prothèse IPD, ou méta-carpophalangienne ce qui implique des dimensions différentes et un dessin des surfaces articulaires différent de façon à autoriser une mobilité latérale adéquate.As is obvious and as also follows from the above, the present invention is not limited to the embodiments more particularly described. She embraces contrary to all variants and in particular those where the anchor rods are non-metallic, for example bio-compatible polyethylene, or are in a metal other than titanium, those where the prosthesis is an IP prosthesis thumb or big toe, or a IPD, or meta-carpophalangeal prosthesis which involves different dimensions and a different articular surface design so as to allow adequate lateral mobility.
Claims (17)
- An orthopedic implant comprising:- an interphalangeal joint head (9),- an intramedullary anchor stem (2, 7, 8, 33, 38, 43, 46, 52) for an orthopedic implant head, separable from the head (9, 10) with which it comprises connecting means (16), said stem having a body (21) that is at least partially recessed longitudinally, parallel or substantially parallel to the dorsal-palmar plane (22),the implant being characterized in that:- said body has a tapered or substantially tapered peg (13) shape,- the head (9) comprises a conical pin (18) and a recess in the form of a groove (20),- the stem comprises at one end a sink-preventing small plate (19) pierced with a recess (17, 50), the recess (17, 50) extending inside said end and surrounded by the small plate (19),the implant being further characterized in that the connecting means (16) are formed by:- a conical interfit between the pin (18) integral with the head in the recess (17) arranged in the corresponding stem, and by- the recess in the form of a groove (20) formed in the head designed for receiving the small plate (19) of complementary shape.
- The implant according to claim 1, characterized in that being substantially elongated about an axis, it has a non-zero radius of curvature arranged to fit inside the medullary cavity of a phalange.
- The implant according to any one of the preceding claims, characterized in that the stem has a sink-preventing end abutment formed by the sink-preventing small plate (19).
- The implant according to any one of the preceding claims, characterized in that the stem has a shape and is made of a material that provides it with an effective Young's modulus Eeff < 30 Gpa.
- The implant according to any one of the preceding claims, characterized in that the stem has an effective Young's modulus Eeff < 15 Gpa.
- The implant according to any one of the preceding claims, characterized in that the stem has a H-shaped cross-section.
- The implant according to any one of claims 1 to 5, characterized in that the stem has a U- or V-shaped cross-section.
- The implant according to any one of claims 1 to 5, characterized in that the stem has a slot (37) shaped like a duck's bill in the dorsal-palmar plane.
- The implant according to any one of claims 1 to 5, characterized in that the stem has a recessed shape that is semicylindrical on the palmar side or is semitubular.
- The implant according to any one of the preceding claims, characterized in that the conical fitting is a Morse taper.
- The implant according to any one of the preceding claims, characterized in that the stem is asymmetrical with respect to a median plane passing through the axis of the recess, parallel to the dorsal-palmar plane.
- The implant according to any one of the preceding claims, characterized in that the stem includes, at least partially, an osteointegration coating strengthening the anchoring.
- The implant according to any one of the preceding claims, characterized in that the stem is made of microporous titanium and/or is coated with hydroxyapatite.
- The implant according to any one of the preceding claims, characterized in that the stem is cut out with at least one recess transversely or substantially transversely crossing said stem.
- The implant according to any one of the preceding claims, characterized in that the head is made of a different material than the stem.
- The implant according to any one of the preceding claims, wherein the body of the stem is made of a biologically compatible material.
- An implant assembly according to any one of the preceding claims, characterized in that the implants include identical connecting means between, on the one hand, several heads of different size and, on the other hand, identical or different stems.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0900053A FR2940759B1 (en) | 2009-01-08 | 2009-01-08 | INTRA MEDULLAIRE ANCHORING ROD FOR ORTHOPEDIC IMPLANT HEAD |
PCT/FR2010/000011 WO2010079289A1 (en) | 2009-01-08 | 2010-01-08 | Intramedullary anchoring stem for an orthopaedic implant head |
Publications (2)
Publication Number | Publication Date |
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EP2385812A1 EP2385812A1 (en) | 2011-11-16 |
EP2385812B1 true EP2385812B1 (en) | 2016-11-23 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10702516.5A Active EP2385812B1 (en) | 2009-01-08 | 2010-01-08 | Intramedullary anchoring stem for an orthopaedic implant head |
Country Status (6)
Country | Link |
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US (1) | US8647390B2 (en) |
EP (1) | EP2385812B1 (en) |
AU (1) | AU2010204243A1 (en) |
CA (1) | CA2748978A1 (en) |
FR (1) | FR2940759B1 (en) |
WO (1) | WO2010079289A1 (en) |
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-
2009
- 2009-01-08 FR FR0900053A patent/FR2940759B1/en not_active Expired - Fee Related
-
2010
- 2010-01-08 CA CA2748978A patent/CA2748978A1/en not_active Abandoned
- 2010-01-08 EP EP10702516.5A patent/EP2385812B1/en active Active
- 2010-01-08 AU AU2010204243A patent/AU2010204243A1/en not_active Abandoned
- 2010-01-08 US US12/918,189 patent/US8647390B2/en active Active
- 2010-01-08 WO PCT/FR2010/000011 patent/WO2010079289A1/en active Application Filing
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WO2010079289A1 (en) | 2010-07-15 |
CA2748978A1 (en) | 2010-07-15 |
AU2010204243A1 (en) | 2011-07-28 |
US20110077652A1 (en) | 2011-03-31 |
US8647390B2 (en) | 2014-02-11 |
EP2385812A1 (en) | 2011-11-16 |
FR2940759B1 (en) | 2011-10-07 |
FR2940759A1 (en) | 2010-07-09 |
WO2010079289A4 (en) | 2010-09-10 |
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